Ncert- class 6- science-Chapter 11: Air Around Us 1 Welcome to your Ncert- class 6- science-Chapter 11: Air Around Us 1 1. Carbon exists in the atmosphere in the form of: carbon monoxide in traces and carbon dioxide carbon monoxide only coal carbon dioxide only None 2. Combustion can not take place without: zinc water Air carbon None 3. Which one of the following gas does not form a part of the atmosphere? Chlorine Nitrogen Oxygen Carbon dioxide None 4. __________ is the most abundant gas in the atmosphere. Oxygen Carbon dioxide Nitrogen None of the above None 5. A greenhouse gas that absorbs energy and maintains earth's temperature is: carbon dioxide nitrogen oxygen argon None 6. Which is the most abundant gas in our atmosphere ? Carbon monoxide Oxygen Carbon dioxide Nitrogen None 7. Which of the following gases do not form part of the atmosphere? Chlorine Carbon idoxide Nitrogen Oxygen None 8. What is the major constituent of air Water vapour Hydrogen Oxygen Nitrogen None 9. Which of these statements are true about air?(i) Air is a mixture of several types of gases.(ii) Air exerts pressure.(iii) The composition of air is constant in the atmosphere. (i) and (iii) (i) and (ii) (i), (ii) and (iii) (ii) and (iii) None 10. What process replenishes the atmosphere with oxygen? Oxygen Cycle Both A and C Water Cycle Photosynthesis None 11. Glass panes usually appear hazy because: they are old. it is the property of transparent substances water vapour settling on the tiny dust particles. None None 12. Which of the following gases burns in air Carbon dioxide Nitrogen Helium Carbon monoxide None 13. Air is regarded as a mixture because: its pressure may vary its composition may vary its temperature may change its volume changes under different conditions None 14. Carbon dioxide constitutes nearly ___ % of the atmosphere. 78 0.03 28 45 None 15. Air has________ composition with________ oxygen at high attitudes. fixed, more variable, more fixed, less variable, less None 16. John finds that, as he blows air into a balloon, it becomes bigger. What inference can John make? Air is matter Air has mass Air occupies space Air is a gas. None 17. Choose the option which justifies the given statement:-Air is considered a mixture, not a compound. It is possible to separate air into its constituent gases by physical methods like fractional distillation. Air does not have a fixed formula like compounds. All of the above Air shows properties same as the constituent gases present in it. None 18. The correct ascending order of gases as per their composition in air is: oxygen < carbon dioxide < nitrogen nitrogen < hydrogen < oxygen hydrogen < oxygen < nitrogen oxygen < carbon dioxide < hydrogen None 19. It is not proper to breathe through our mouth because: more carbon dioxide will be inhaled our throat will become sore the dust particles would enter our bodies we will catch cold easily None 20. The percentage of nitrogen and oxygen in air is: 99% by volume 21% by volume 37% by weight 50% by weight None Time's up Please Share This Share this content Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Leave a Reply Cancel replyCommentEnter your name or username to commentEnter your email address to commentEnter your website URL (optional) Save my name, email, and website in this browser for the next time I comment.
